Table 1. Characteristics of the nine candidate reference genes.

Gene	Full name	Accession number	Cellular function
18S rRNA	18S ribosomal RNA	HQ686070	Ribosome subunit
ACT	Beta Actin	KJ543460	Cytoskeletal structural protein
BHLH	Basic helix-loop-helix	KJ543467	Transcription factor
CLA	Clathrin	KJ543465	Clathrin adaptor complex
CYP	Cycolphilin A	KJ543464	Serine-threonine phosphatase inhibitor
EF1	Elongation factor 1-a	KJ543461	Eukaryotic elongation factor 1
GAPDH	Glyceraldehyde-3-phosphate dehydrogenase	KJ543468	Oxidoreductase in glycolysis and gluconeogenesis
SAND	SAND family protein	KJ543463	Hypothetical proteins
TIP41	TIP41 family protein	KJ543466	Tonoplast intrinsic proteins